Which OpenType features are in the font I want to license?

The OpenType features available in each font can be found on the font’s page. For example if you want to see which features are available in the Semplicita Pro font, go to its page here. Scroll down and click on the small OT square in the Fontsampler area, and all the OpenType features included in the font will be listed there. In fact you can test those features right there in the Fontsampler.